Display screen or portion thereof with a graphical user interface



The patent or application file contains at least one drawing executed incolor. Copies of this patent or patent application publication withcolor drawing(s) will be provided by the Office upon request and paymentof the necessary fee.

FIG. 1 is a front view of a display screen or portion thereof with agraphical user interface showing the new design; and

FIG. 2 is a front view of a second embodiment thereof.

The broken lines showing display screens, portions of display screens,text, and graphical elements form no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof witha graphical user interface, as shown and described.